PDF malware analysis — malicious · bf9ba6bcc33d87ed

MALICIOUS

PDF

55.0 KB Created: 2020-09-05 09:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b433561cbdafc16c6a73b3acbc73574f SHA-1: 515812a42142df91ef38ac61884a8cd7fab63fff SHA-256: bf9ba6bcc33d87ed776816722f7d99d2bb7f92f41655fc00a693ce0d4e967938

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link disguised as a document title, which redirects to a malicious URL. This suggests a phishing or social engineering attack aimed at tricking the user into visiting a compromised site. The PDF itself is generated by wkhtmltopdf, and the ML classifier strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.link/wix?keyword=group+guided+reading+pdf
- https://cdn.shopify.com/s/files/1/0433/2729/1544/files/kuwuxofubog.pdf
- https://cdn.shopify.com/s/files/1/0430/3123/2674/files/zakeki.pdf
- https://cdn.shopify.com/s/files/1/0459/6708/1639/files/43198419115.pdf
- https://cdn.shopify.com/s/files/1/0435/9444/9055/files/40449606449.pdf
- https://cdn.shopify.com/s/files/1/0430/3332/9815/files/58873203189.pdf
- https://static.usrfiles.com/ugd/26938b_85e7f0adb2044a4ab88eab8d9c8a5196.pdf
- https://static.usrfiles.com/ugd/5360f8_4b71f41d753045f9882f36e827448948.pdf
- https://static.usrfiles.com/ugd/9f69bd_7308472dac8344b79883d1f95344dbba.pdf
- https://static.usrfiles.com/ugd/6f9b04_29a42da45419472682192e5519ed7f81.pdf
- https://static.usrfiles.com/ugd/0a593f_b896903cac48405b9c5d70a79cc2cdf6.pdf
- https://static.usrfiles.com/ugd/4bdc6d_283c38042a334cadb6db840098a01ec7.pdf
- https://static.usrfiles.com/ugd/3fb742_96d683089c0848daa5c230e1979e95b0.pdf
- https://static.usrfiles.com/ugd/de3d83_557ff1e9d6c84c8eae88a74cd5d00b5f.pdf
- https://static.usrfiles.com/ugd/b5973a_e32daf2dfd3e4ee79345014908a9962d.pdf
- https://static.usrfiles.com/ugd/4cf28d_d11f9f71841f435e9055fed8661016f5.pdf
- https://static.usrfiles.com/ugd/003b86_1756840cb1b14d3582170bd73ce8cc1f.pdf
- https://static.usrfiles.com/ugd/9ff9b8_06f044a8f9ad48459f32f695dff2f623.pdf
- https://static.usrfiles.com/ugd/851c7c_1750634e83c34ae08632ee5b2413cbe9.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00008e10.bin` `adfaa9daba429845ef0fc960476d53226c3db2c76e79784b1e0d4c7c6d2be475`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E10	5032 bytes
`font_01_sfnt_off00009f40.bin` `e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9F40	1800 bytes
`font_02_sfnt_off0000a7ce.bin` `c7c94c672414554a05a1a3de6717fd7d08ac9c01d68f2b71ecc13548646e65dc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7CE	11464 bytes

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